Spi 19-325-0 Class Zz Minus Plug Pin Gage 0.325 in

Product Description

The SPI 19-325-0 is a Class ZZ minus plug pin gage with a 0.325-inch nominal diameter, manufactured from steel. Pin gages are used to verify bore diameters, hole sizes, and slot widths to a precise tolerance. This gage carries a minus tolerance of 0.0002 inches, meaning it is ground to the lower boundary of the nominal size, which allows for go/no-go inspection workflows common in machining and quality control environments. Machinists, toolmakers, and quality technicians use plug pin gages during in-process and final inspection of machined components.

This gage is suited for shop-floor and inspection room use where accurate hole measurement is required. Class ZZ is a working-grade gage tolerance class appropriate for general inspection of production parts. The 0.325-inch diameter makes it a practical choice for checking holes and bores in that size range on machined metal parts, fixtures, and assemblies. It is a single gage unit sold individually.

Key Features

• Class ZZ minus tolerance — ground to the lower boundary of nominal diameter for go-type inspection use
• 0.0002-inch tolerance for precise dimensional verification
• 0.325-inch nominal diameter
• Steel construction for durability in shop-floor conditions
• Single-unit packaging suitable for individual replacement or kit supplementing

Compatibility

Designed as a working-grade plug pin gage for general inspection of bores and holes at the 0.325-inch nominal diameter in machined components and assemblies.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians — no power tools or mechanical installation is required. Clean the gage and the bore being checked before use to prevent debris from affecting readings. Store the gage in a protective case away from other tooling to prevent nicks and surface damage. Periodic calibration against a traceable standard is recommended to confirm gage integrity over time.